<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script src="https://cdn.bootcss.com/react/15.4.2/react.min.js"></script>
    <script src="https://cdn.bootcss.com/react/15.4.2/react-dom.min.js"></script>
    <script src="https://cdn.bootcss.com/babel-standalone/6.22.1/babel.min.js"></script>
</head>
<body>
    <script type="text/babel">
        class Hello extends React.Component{
            constructor(props){
                super(props)
            }
            render(){
                return <h1>Hello</h1>
            }
        }
          ReactDOM.render(
            <Hello/>,
            document.getElementById('example')
          );
</script>
</body>
</html>